Friction driving element



Patented AMay 15, 1923.

vUNITED f fr WILLIS s. CRANDELL, or ELsMERE, NEW YORK, Assr'eNon 'rOALr'sANv PAPER ivIInI; MACHINERY COMPANY, INC.,- or ALBANY,v NEW Yoan, A' CORPORATION orNEw` YORK.

FRICTION DRIVING ELEMENT.

Application mea nuyio, i922. seriaiNo. magna To all whom t may concern.' g c i Be it known that I, WILLIS S. CRANDnLL, a

citizen of the United States, a resident of' Elsmere, in the county of Albany and State of New York, have invented a certain new and useful Frictionv Driving Element, ofl

which the following is a specification.

rlhe invention has for an object `to provide a friction gear or friction driving element wherein the materialwhich is relied upon for the driving surface may be removed from the driving element while the latter is in operative position on the shaft, for example, to permitrepairs to or ,replacement of such friction material.

Another object is to maintain such friction material` in such proper relation on the driving element as to furnish a driving surface of uniform and proper quality while still permitting ity to be readily removed as aforesaid. Further objects and advantages of the invention will be in part obvious and inA part specifically pointed out in the description hereinafter contained, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof; such embodiment, however, is to be considered merely as illustrative of its principle. In the drawings Fig. l is a side view of a friction driving element constructed in accordance with the invention, certain of its parts appearing in section. v

Fig. 2 is an end view of the structure shown in Fig. l.

Fig. 3 is a fragmentary sectional view taken on line 3 3 of Fig. l/lookingin the direction of the arrows.

If the friction driving element or gear be constructed of, or employing, a material inV annular form, enclosing the shaft in connection with which the driving element is used, it is necessary to remove the driving element l from such shaft, or to demount the shaft in caso repairs to or replacement of the driving element is necessary, which operation often may involve demounting a substantial numloer of machine elements, and which requires so much time as to involve undue losses on account of enforced idleness of the machinery in connection with which the friction driving element is used.

According to the present invention, I construct the friction driving element ofr apsupporting core l, which ordinarily will be annular in form, and provided with a hub 2 if desired, and the material which' is relied Aupon to furnish the friction driving surface is placedover 0r around.thesupporting core, not 1n the form lof endless vbandsor` disks which would require demoiinting the shaft to permit removal, butinthe form .of

a strip orjstrips having ends capable of being freed from the core l to permit the friction material to be removed at anyv timewithout disturbing the .supporting core or other parts of a powertransmission apparatus. ,InA the illustrated embodiment, this friction mate-q rial is comprised of a strip 3,which may be of any suitable fabric, hide, composition ory thev like known tothose skilled inthe art asl adapted for such purposes, and suchstrip 31 is wound spirally around the outersurface y A of the core member l, the adjacentturns of the spiral being in contact with eachother, and thusmaking up a substantially continuous `friction driving surfaceover substanlially the whole outer area of the core-mem* "er, o 1 f I As shown, the outer vsurface of the core member is conical, flanges 4 and 5 being; provided respectively at its smaller and larger extremities toassist in "holding the friction material in place. f '.5

The'ends of the strip of friction'material are suitably secured in position, this being accomplished in the present instance by providing holes 6 and 7 in the core member l through which the ends of the strip 3 are 'l passed into engagement with clamping devices. As is shownin Figs. l and'3, a bolt 8 may be passed through one wall of the supporting core l adjacent the hole 6r previously mentioned, and forced against the correspondingend ofthe strip 3 to hold the -l'atter securely in position.

I prefer also to' provide in the driving element, means `for exerting tension on the fric-y tion material tovmaintain it taut against the y 1 outersurface of the' core, or take up any.4 stretch lwhich mayI vtend to occur therein.

This result is secured in the present embodi- 15iasaloove deseri'loedJv` g f v,Where `the'Coveringof rietionmziteriel is sion on Athe rstrip 3, for eXarnple-byvmeans of a compression spring ll surrounding u rod l2 extending` from the angle piece, the

, spring llaeting hetweene Washer 13 on the f5 endo'isuehrod, and a lug vlt on the hub-V2.

of the supporting core, through which lug rod 12 is passed. 1

'In replacing the friction material one end of the strip inav he pleced' through hole 6 and securedby loolt, and the shaftfcerrying the driving` element then rotated to Wind-the str'pif-S tightly. around-its core, lifter which the remaining' endof'thef strip' may be passed throulffh theliele 7 and securedin'position Inadel up lay-Winding or Wrapping e strip of iri'ctlonmzilterialaround the eor'e in spiral formes above described, i prefer to direct i thepitehof' the spiral (When'Woundi-om the ixedendfof the strip.) p oppositely to the direction in' which, the driving element Will tained taut. l v

'-,VVhile specific ernloodiment-oil thef nven` tionhas been described,lk itv Will hey obviousy thatl many changes may be inede .therein Without departing.froinltheiprinciple of thel invent-ion, as'defined following'eliins.

l claim l.y A friction driving elementeo'noqorising'V en annular supporting core having an aperturey there-in, 2t Covering oversald core Coinprising a strip of friction materialhaving :in end projectinginwardly ,thlroughsaidf f inwardly projecting endfof the strip coniprisingfaln ang-le piece secured '.tovseiidend,V Y a, rod slidavblewith regard to vseid core sind* extending from said' single piece," and a spring urging seid *rod toy maintain the strip taut over the core.

wherein' the core,isfp'rovi'ded'witha hub havand'e'part on the rod'. i In testimony that l have hereuntoset my hand kthis-28th of June, 1922. n

' WILLIS'- CRANDELL.l

larn the 'foregoinz ay aperture; .ineens fer exertingjtension `on said i 2. Thecoinbinetion' set ortli in claim l,V

.ing` slug' slidtbly `receiving seid-rod, and said springfis interposed between said' lug Y 

